Kamala Harris sidesteps question of her role to take Biden's message on the road

Aides and allies say it is too early to define the vice-president's portfolio but she is unlikely to be confined to just one subject area

White House aides and allies stress it's still too early to define the type of portfolio Kamala Harris will have as vice-president. They bristle at the suggestion that Harris would be confined to one project or focus on just one subject area, as some previous vice-presidents were pegged to do.

But over the last week, the former California senator has once again taken on an increasingly familiar mantle: top surrogate for promoting the Biden administration's agenda.